If you want some of the 3rd party, non-free softwares like Adobe Acroread, Real Player, Google Earth and Skype etc, you can always grab them on to your Ubuntu desktop by adding Medibuntu (Multimedia, Entertainment & Distractions In Ubuntu) repositories into software sources.
To quickly add the Medibuntu repository in to your Jaunty Jakalope, go to System > Administration > Software Sources, click on Third party Software, and then add the following line.
deb http://packages.medibuntu.org/ jaunty free non-free
This line can also be appended manually to /etc/apt/sources file as follows.
# sudo echo "deb http://packages.medibuntu.org/ jaunty free non-free" >> /etc/apt/sources.list
You will be prompted for Medibuntu key. You can download it from Medibuntu.org and install it via System > Administration > Synaptic Manager or run the following command in console.
# sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update
Now you’re all set to grab the packages provided by Medibuntu repositories easily.
Have fun!